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| author | Eric Dumazet <edumazet@google.com> | 2014-06-06 06:44:03 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-06-08 14:15:14 -0700 |
| commit | 87757a917b0b3c0787e0563c679762152be81312 (patch) | |
| tree | ffc8bfa37fc3db09ac90bff273fbf13085e8d558 /net/core/dev.c | |
| parent | ba6de0f5304ccdc45ae260e7e0feb6e0ef2dd558 (diff) | |
| download | lwn-87757a917b0b3c0787e0563c679762152be81312.tar.gz lwn-87757a917b0b3c0787e0563c679762152be81312.zip | |
net: force a list_del() in unregister_netdevice_many()
unregister_netdevice_many() API is error prone and we had too
many bugs because of dangling LIST_HEAD on stacks.
See commit f87e6f47933e3e ("net: dont leave active on stack LIST_HEAD")
In fact, instead of making sure no caller leaves an active list_head,
just force a list_del() in the callee. No one seems to need to access
the list after unregister_netdevice_many()
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/dev.c')
| -rw-r--r-- | net/core/dev.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index fb8b0546485b..a30bef1882f5 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -6613,6 +6613,9 @@ EXPORT_SYMBOL(unregister_netdevice_queue); /** * unregister_netdevice_many - unregister many devices * @head: list of devices + * + * Note: As most callers use a stack allocated list_head, + * we force a list_del() to make sure stack wont be corrupted later. */ void unregister_netdevice_many(struct list_head *head) { @@ -6622,6 +6625,7 @@ void unregister_netdevice_many(struct list_head *head) rollback_registered_many(head); list_for_each_entry(dev, head, unreg_list) net_set_todo(dev); + list_del(head); } } EXPORT_SYMBOL(unregister_netdevice_many); @@ -7077,7 +7081,6 @@ static void __net_exit default_device_exit_batch(struct list_head *net_list) } } unregister_netdevice_many(&dev_kill_list); - list_del(&dev_kill_list); rtnl_unlock(); } |